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LED Grow Lights' spectral range impact on plant physiology

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發表於 2014-1-1 19:19:48 | 顯示全部樓層 |閱讀模式
LED spectral range impact on plant physiology

280 ~ 315nm influence on morphological and physiological processes is minimal

315 ~ 400nnm chlorophyll absorbs less impact photoperiod effect , prevent stem elongation

400 ~ 520nm ( blue ) chlorophyll and carotenoids absorbed the largest proportion , the greatest impact on photosynthesis

520 ~ 610nm dye absorption rate is not high

610 ~ 720nm ( red ) chlorophyll absorption rate, have a significant effect on photosynthesis and photoperiod effect

720 ~ 1000nm absorption rate, stimulate cell elongation , impact of flowering and seed germination

> 1000nm converted into heat



In 2004, 7 ( 2 ) of the Flower Tech publications are articles discuss the impact of the color of light for photosynthesis. The author is Mr. Harry Stijger. Sub- title of the article said that generally we think the color of light for photosynthesis is different , in fact, in the process of photosynthesis , the light of the impact of color is no different , so use the full spectrum of the most conducive to the development of plants.

Spectral sensitivity of plants and people are different eye . The human eye is most sensitive spectrum of 555nm, between yellow - green. Blue and red light district on the less sensitive area . Plants are not, for the most sensitive red spectrum , less sensitive to green light , but the difference in the sensitivity of the human eye does not seem so huge . Plants maximum spectral sensitivity region 400 ~ 700nm. This section usually called photosynthesis effective energy spectral region . About 45% of the energy of the sun is located paragraph spectrum. Therefore, if the amount of artificial light to supplement the light , the spectral distribution of the light source should be close to this range.

Photon energy of light emitted by different wavelengths . E.g. wavelength 400nm ( blue ) to 1.75 times the energy of 700nm ( red light ) energy. But for photosynthesis , the effect is the result of two of the same wavelength . Blue spectrum can not be used as the excess energy is photosynthesis into heat. In other words , the rate of photosynthesis of plants is determined by the number of photons 400 ~ 700nm can be absorbed by plants , with the number of photons is not sent by the relevant spectrum . But most people think that light colors Liberal affect the rate of photosynthesis . All spectra plants , the different sensitivity . The reason for this comes from the pigments in leaves (pigments) special absorbent . Among the best known of chlorophyll dawn . But chlorophyll is not only useful for photosynthetic pigments . Other pigments are involved in photosynthesis , photosynthetic efficiency and therefore not only consider the absorption spectrum of chlorophyll.

Photosynthesis is not different paths associated with the color. Light energy from the leaf chlorophyll and carotenoids are absorbed. With two kinds of photosynthetic energy systems to water and carbon dioxide fixation transformed into glucose and oxygen. This process uses all the visible spectrum , so a variety of different colors of light almost no impact photosynthesis.

Some researchers believe that the greatest part of the orange light of photosynthetic capacity. But this does not mean that the plant should be cultivated in such a monochromatic light source . Morphological development of the plant and leaf color , the plants should receive the balance of the various light sources .

Blue light (400 ~ 500nm) on plant differentiation and stomatal regulation is very important. If the blue light enough too far-red ratio of the stems will grow excessively , and likely to cause leaf yellowing . Ratio red spectrum (655 ~ 665nm) and the far-red spectral energy (725 ~ 735nm) of energy between 1.0 and 1.2 which is a positive development of the plants will grow . For each plant , but these spectral sensitivity of different proportions .

In the greenhouse HPS as often artificial light . To Philips Master SON-TPIA light source , for example, in the orange region of the spectrum has the highest energy. However, in the far- infrared light energy is not high , so the red / far-red energy ratio greater than 2.0 . However, due to the greenhouse still natural sunlight , and therefore did not result in shorter plants . ( If you use this source in the growth chamber , it may have an impact. )

In natural sunlight , Blu-ray energy share of 20%. Artificial light source, and does not require such a high proportion. The normal development of the plant , the plant only in the most 400 ~ 700nm range of 6 % ​​of the blue energy . In natural sunlight , enough already this Blu-ray energy. Therefore, no additional add more artificial light blue spectrum. However, lack of natural light (such as in winter ) , artificial light blue energy needs increase , otherwise the blue light will be the limiting factor for plant growth . But if that is not light for improvement , there are still other ways to remedy this problem of insufficient light . For example, the temperature adjustment or the administration of growth hormone.
vitaLED Technologies Co., Ltd. is a manufacturer and supplier of LED Light Fixtures with the factory in Taiwan. We produce and supply LED Tube Lights, LED Bulb Lights, LED Flexible Strip Lights, LED Downlight, LED Track Lights, LED Controller, LED Warning Lights, Billboard LED Lights, LED Aquarium Lights, Horticulture LED Growing Lights, LED Clamp Lights, LED Camping Lights, LED Floodlights, LED Spotlights, LED Highbay Lights. If you are interested in any models of our products, please feel free to contact us.

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